Winding process for filaments of artificial origin



Feb. 8, 1938.

K. SCHMIDT WINDING RROCESS FOR FILAMENTS OF ARTIFICIAL ORIGIN Filed Dec. 8, 1933 Patented Feb. 8, 1938 UNITED STATES PATENT OFFICE WINDING PROCESS FOR FILAMENTS OF ARTIFICIAL ORIGIN Application December 3, 1933, Serial No. 701,433

In Germany December 9, 1932 v 3 Claims.

This invention relates to improvements in the winding of filaments of artificial origin, but primarily has for its object a method and apparatus for the winding of freshly extruded filaments.

It is known that attempts have been made to use ring twisting machines for the winding of freshly spun artificial filaments in order to accomplish two operations in one, namely, the simultaneous winding and twisting of the yarn. It has been found that this process has been used with a fair measure of success in the dry spinning process.

This method of simultaneously twisting and winding the freshly extruded filaments has not,

however, heretofore proven successful with the wet spinning of artificial filaments, particularly freshly spun viscose, or cuprammonium yarn, due to the fact that the filaments being wet are quite swollen and therefore comparatively weak and unable to withstand the ballooning of the thread and the friction on the twisting cap. Another drawback has been a stretching of the thread during the winding onto the spool which is undesirable.

It has now been found that it is possible to wind the freshly extruded filaments by means of a take-up roller and twisting spindle and whereby a small amount of twist is given the thread which process forms the subject-matter of this appli- O cation.

In the experiments which were formerly attempted, the objective was to obtain a normally or fully twisted thread. It was therefore found necessary to drive the twisting spindle at a speed of 5 100 revolutions or more per meter of take-up of the thread. The results of these high speeds were at best to produce a very inferior thread. By reducing the speed of the twisting spindle so that a twist of not more than turns per meter results,

q this winding method can be successfully carried out. It has been found that even better results are obtained if 10 turns per meter or less are produced. With this method a suitably slight stretching of the thread results.

3 The solutions of the different problems heretofore encountered in the Winding of freshly extruded filaments are found in the use of twisting spindles and similar devices due to the fact that only so much thread is Wound on the spool as is supplied by the take-up roller, with the result that the filaments are wound with little or no friction and tension. It is therefore readily seen that the intermittent distortions encountered in the ordinary spool spinning process, which are 3 caused by the oscillation of the thread guide, are

with this method eliminated inasmuch as a flexible guiding means is used which follows the path of the thread, such as a traveller or other like devices.

By giving the filaments this slight twist, an improved winding, Washing, desulphurization, bleaching etc., results due to prevention of the matting and washing out of layers of thread. V ariations which might perhaps occur in this low twist have practically no effect upon the uniformity of the higher twist which is given when the filaments are put through the twisting operation.

The device to carry out the method according to the present invention may be constructed in such a way that spooled yarn packages of any kind may be obtained as they are produced on spool spinning machines. The ring and traveller used are of course made of material which is acid resistant.

It is therefore one object of the present invention to provide a means for the winding of filaments of artificial origin whereby a better after treatment of the yarn is given.

Another object of the present invention is to provide a method and apparatus whereby a slight twist is given to the freshly extruded filaments as they are being wound on the spool, thereby resulting in an improved yarn body.

These and other objects will in part become obvious and in part be pointed out in the following specification taken in conjunction with the accompanying drawing, in which the arrangement of apparatus for carrying out my improved process is diagrammatically illustrated in a side elevation, parts being shown in section.

In the drawing in which like numerals of reference indicate like parts, 1 indicates a spinning nozzle from which the filaments 2 are extruded and pass through the coagulating bath 3 in a trough 4. The filaments 2 are then passed over a driven take-up roller 5 which is rotating at a predetermined speed for withdrawing the threads. The thread is then passed downwardly through a thread guide 6 to a traveller l which rides on a circular ring 8. This ring 8 is reciprocated up and down on a rod 9 by a suitable means (not shown).

The filaments are then collected on the usual type of perforated spool H! which is centered on a twisting spindle l l and held in place by a cover l2.

From the foregoing description, taken in connection with the accompanying drawing, it is thought that the process and the advantages thereof will be sufiiciently clear to any one skilled in the art to which it relates.

lecting the thread on a spool, said spool being rotated at a speed which only imparts a twist to the thread of less than twenty turns to the meter.

3. In a process for the winding on spools of artificial filaments freshly extruded by the wetspinning process, the steps of drawing the filaments at a constant speed, imparting a twist to the filaments of less than twenty twists to the meter, and collecting the slightly twisted filaments.

KUR SCHM 

